<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script>
    //函数运行在严格模式底下
   "use strict"
    var a="a";

   eval("var a='b';console.log(a)");
   console.log(a)

    /*test();
    function test() {
        console.log("test");
        arguments.callee();
    }*/

    console.log(Object.getOwnPropertyDescriptor(Object,"prototype"))
    delete Object.prototype;

</script>
</html>